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4. K. S. Mazdiyasni, Ceram. Int.
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5. M. D. Sacks, H. W. Lee and J. A. Pask, in “Ceramic Transactions”, Vol. 6, “Mullite and Mullite Matrix Composites”, edited by S. Somiya, R. F. Davis and J. A. Pask (American Ceramic Society, Westerville, Ohio, 1990) p. 167.